Bacteria has nowhere to grip.
Most hot tub shells are acrylic over fiberglass, a porous surface bacteria can settle into and hide from your chemicals. An Eco Spa is one solid piece of non-porous HDPE. There's no surface for bacteria to grow on, so it takes very few chemicals to keep the water clean.
"Bet you 50 bucks you won't drink that hot tub water."
The point in one line: if the water isn't clean enough to drink, why are you soaking in it? An easy bet to win once you've felt how clean an Eco Spa stays, even sitting unused between soaks.
It comes down to the surface.
Same water, same chemicals, the difference is what they're sitting against. Here's what that looks like up close.
Acrylic / Fiberglass
- ✕Build, acrylic layered over fiberglass.
- ✕Gel coat, can blister and peel.
- ✕Warranty, shell coverage runs out.
HDPE Unibody
- ✓Build, one rotationally-molded piece of HDPE.
- ✓Gel coat, none; solid through.
- ✓Warranty, shell warranted for life.
The shell does half the work. We handle the rest two ways.
The shell keeps bacteria from establishing in the first place. On top of that, every Eco Spa runs 100 ft of filtration through two large filters, with the optional Ecozone ozone upgrade to go further, as we put it: "we go overkill."
Two large filters and the non-porous shell do most of the cleaning automatically, "overkill," by design. Add Ecozone ozone to go further still.
About a tablespoon of chlorine every one to two weeks, depending on how often you use it. That's it.
You don't even need to shower after a soak, no chlorine smell clinging, skin doesn't feel dry.
To be clear: this isn't a zero-chemical hot tub, and we don't pretend it is. You still test and add a little chlorine, just far less than a porous tub needs, because the shell and the filtration are doing most of the work.